When I built up my first maxx...I put a megatech 16 in it. I did nothing to the tranny, it was stock.
It took a good 4 tanks anyways, but it did eventually shift.
Maybe, if its newer, run it by the shop you got it at, should be somone there to put an eyeball on it to make sure itll be good to go.
I have no first hand exp. with this truck, i know the maxx and yours are 2 different beasts.